.table1{

    margin: 0 auto;

}
.td3{

    width: 150px;
    height: 40px;

    text-align: center;
}
.btn1{

    width: 120px;
    height: 30px;
}
#main{
    width: 600px;
    height:400px;
    float: left
}
#main2{
    width: 600px;
    height:400px;
    float: left
}